<template>
  <div id="app">
    <div class="container">
      <!-- 顶部框模块 -->
      <div class="form-group">
        <div class="input-group">
          <h4>品牌管理</h4>
        </div>
      </div>

      <!-- 数据表格 -->
      <table class="table table-bordered table-hover mt-2">
        <thead>
          <tr>
            <th>编号</th>
            <th>资产名称</th>
            <th>价格</th>
            <th>创建时间</th>
            <th>操作</th>
          </tr>
        </thead>
        <tbody>
          <tr v-for="(obj,index) in list" :key="obj.id">
            <td>{{ obj.id }}</td>
            <td>{{ obj.name }}</td>

            <!-- 如果价格超过100，就有red这个类 -->
            <td :class="{ red : obj.price>100 }">{{ obj.price }}</td>
            <td>{{ obj.time | formatDate }}</td>
            <td><a href="#" @click="delFn(index)">删除</a></td>
          </tr>
          <tr>
            <td colspan="2">总价：{{ all }}</td>
            <td colspan="2">平均价：{{ ave }}</td>
          </tr>
        </tbody>

        <tfoot v-show="list.length === 0">
          <tr>
            <td colspan="5" style="text-align: center">暂无数据</td>
          </tr>
        </tfoot>

      </table>

      <!-- 添加资产 -->
      <form class="form-inline">
        <div class="form-group">
          <div class="input-group">
            <input type="text" class="form-control" placeholder="资产名称" v-model="name" />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <div class="form-group">
          <div class="input-group">
            <input type="number" class="form-control" placeholder="价格" v-model="price" />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <!-- 阻止表单提交 -->
        <button class="btn btn-primary" @click.prevent="addFn">添加资产</button>
      </form>
    </div>
  </div>
</template>

<script>
import moment from 'moment'
export default {
  data() {
    return {
      name: "", // 名称
      price: 0, // 价格
      list: JSON.parse(localStorage.getItem('list')) || []
      // list: [
      // { id: 100, name: "外套", price: 199, time: new Date('2010-08-12') },
      // { id: 101, name: "裤子", price: 34, time: new Date('2013-09-01') },
      // { id: 102, name: "鞋", price: 25.4, time: new Date('2018-11-22') },
      // { id: 103, name: "头发", price: 19900, time: new Date('2020-12-12') }
      // ],
    };
  },
  watch: {
    list: {
      handler() {
        localStorage.setItem('list', JSON.stringify(this.list));
      },
      deep: true,
    }
  },
  computed: {
    all() {
      return this.list.reduce((prev, obj) => prev += +obj.price, 0)
    },
    ave() {
      return (this.all / this.list.length).toFixed(2)
    }
  },
  methods: {
    addFn() {
      if (this.name.length === 0 || this.price.length === 0) {
        alert('输入不能为空')
        return
      }
      this.list.push({
        id: this.list.length ? this.list[this.list.length - 1].id + 1 : 100,
        name: this.name,
        price: this.price,
        time: new Date()
      })
      this.name = '',
      this.price = 0
    },
    delFn(index) {
      this.list.splice(index, 1)
    }

  },
  filters: {
    formatDate(val) {
      return moment(val).format('YYYY-MM-DD')
    }
  }

}
</script>

<style >
.red {
  color: red;
}
</style>